Use of nanoparticles in moisture wicking clothing and other products for bacterial and related odour control is extremely controversial, has been likened to asbestos and could be a serious future health hazard. Please see, for example, http://www.asbestos.net/news/could-nanoparticles-be-the-next-asbestos.html
For safety it would be advisable to use moisture wicking clothing that does not incorporate nanoparticles into the technology.
The first paragraph above was obviously written as an advertisement for a particular online retailer. Caveat emptor. Do your own checking on the use of nanoparticles. No retail outlet will have a clue about this kind of issue.